The Bible has according to the Bible stayed the same through the ages Matthew 5:18. 18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled. Jot is the smallest Greek form of writing but if you don’t believe in the inerrancy of scripture. There are more variant then word in the Greek New Testament this is only because in Greek there are like 10 different ways to write a single sentence. 70% of the difference are spelling because Greek is such a complex language. Then again between those to variant are account for 99%. The best difference we know is mark 16 and in most Bible it is baracted out and it says in the Bible not included. There is a great pastor who study textual criticism of the Bible this is a great way for you to learn more on this. It is the Dive deeper button will take you to the podcast.